Sentence examples for had started doing from inspiring English sources

The phrase "had started doing" is grammatically correct and commonly used in written English.
It is the past perfect tense of the verb "start," indicating that an action began in the past but was completed or still ongoing at a more recent time in the past. Here are a few examples of how to use it: - The project was already behind schedule because they had started doing the research late. - By the time I arrived, they had already started doing the dishes. - He had started doing his homework when his friends invited him to go out. - We had started doing yoga together every morning, but then she got injured and we had to stop. - The company had started doing business in China in the early 2000s, but it wasn't until recently that they saw significant growth in that market.